Naji, the polar bear, kangaroo, artic fox......they were all on the same land mass as Noah. It's a theory at the time of Noah the land mass of earth were all connected.....the flood caused the land to change.

There was a time when the land masses were all one continent, true, but that was just a teensy weensy bit before your stupid flood is alleged to have happened and also before polar bears, kangaroos, and all the other creatures aboard the ark had evolved.